Molding brake-shoe inserts



H. JONES. MOLDING BRAKE SHOEINSEBTS. APPLICATION FILED JULY 24. 1920.

Patented Apr. 26; 1921. i 1 7 if I "29 7 I 1111mm 6' l WWHHIUW HHHIIWi'UNITE snares PATENT OFFICE.

HARRY JONES, 0F SUFFERN, NEW YQRK, ASSIGNOR TO THE AMERICAN BRAKE SHOE &FOUNDRY COMPANY, Q33 WILMINGTON, DELAW'ARE, A COBPOEATION 0 DELA WARE.

MOLDING BEAKE-SHOE INSERTS.

Specification of Letters Patent. Patented Apr. 26, 1921.

Application filed July 24, 1920. Serial No. 398,692.

To all whom it may concern:

Be it known that I, HARRY J ONES, a citizen of the United Stat-es,residing at Sufiern, in the county of Rockland and State of New York,have invented certain new and useful Improvements in Molding Brake-ShoeInserts, of which the following is a specification.

This invention relates to the manufacture of brake shoe inserts of thattype which comprises a plurality of blocks or sections cast at intervalson supporting strips of reticulated metal, such as expanded metal orwire mesh.

The object of this invention is to make it possible to produce brakeshoe inserts of the kind above described in green sand molds, andthereby avoid the necessity of providing numerous cores which would berequired in ordinary foundry practice and seriously retard productionand increase the cost.

A further object of the invention is to simplify and improve thepreparation of the mold for making the insert by the provision of meansfor blowing out any sand that may have entered the mold cavities withoutinjuring the surface of the mold, and also facilitating the removal ofthe patterns from the mold without injury to the mold.

In ordinary foundry practice it does not appear to be practicableto'make a mold wherein strips of reticulated metal are placed in alongitudinal position, passing alternately through the sand portion ofthe mold and through a series of mold cavities, each cavity of theseries forming a separate casting when metal is poured therein, it beingrequirel that said strips be held firmly in position during the process0f molding and that the several cast portions of insert form a solid.cast body through and about the connecting metal strips in the processof casting.

In the manufacture, by ordinary foundry practice, of the limited numbersof these inserts necessary to test their efficiency it was foundnecessary to construct a core box in which strips of expanded metal werearranged. Core sand was then'rammed into the core box and the core wasturned out on a plate and baked, after which the core sand was pickedout from among the'expanded metal strips in sections of the core wherecast portions of insert were required. This core was then placed in agreen sand mold wherein gate runners were cut, connecting each of theindividual molds to a main runner or gate, so that each of the molds wasfilled from one pouring gate.

My invention provides a series of patterns of necessary shape anddimensions for formmg each of the cast sections of the insert; saidpatterns are properly placed on a pat tern plate and projected throughsuitable openingsin a stripping plate. For such a1"- rangement, I claimno invention. However, I do claim invention in the provision of suitableslots or recesses in these patterns, so arranged as to permit droppingof continuous longitudinal strips of reticulated metal into positionrequired in the construc tion of the insert, said strips resting firmlyon the stripping plate and being held firmly in position as to lateralemplacement during the processes of ramming sand into the mold anddrawing the patterns through the stripping plate preparatory to liftingthe mold therefrom.

I claim further invention in the means of applying jets of air to eachof the mold cavities for the purpose of removing such molding sand asmay find its way into slots or recesses in the patterns and remainclinging to the strips of reticulated metal, where they pass through themold cavities, after patterns are withdrawn, such air jets being appliedbefore the mold is lifted from the stripping plate so that the surfaceof the mold is not broken or disturbed by its application.

It is further a matter of great convenience to have these series ofinsert patterns fitted with air jets that are operated simulta neously.

In the accompanying drawings illustrating a selected embodiment of theinvention Figure 1 is a perspective view of a machine for making twoinserts, showing the flask and stripping plate partly broken away andwith expanded metal strips arranged in one set of patterns;

Fig. 2 is a perspective view of the drag part of the flask ready toreceive the cope; and

Fig. 3 is a perspective View of one of the patterns for forming the moldcavity for the insert blocks or sections.

Referring to the drawings, 4 is a vertically movable support suitablyguided in the frame 5 of the machine and adapted to be operated by ashaft 6 connected with the support in any suitable manner. A patternplate 7 is mounted on the support and guided in the frame and this platecarries a plurality of patterns 8 each of which con sists of a blockprovided in its upper portion with a plurality of parallel slots '9spaced apart a predetermined distance to receive the strips 10. Astripping plate 11 is mounted on the frame and is provided with aplurality of openings 12 through which the upper slotted portions of thepatterns project and the construction is such that in operative positionthe bottom of the slots will lie in substantially the plane of the topof the stripping plate. The strips 10 are supported in parallel positionin the slots of the patterns and rest upon the bottom of the slots andupon the stripping plate. Each of the patterns is provided with an airchamber 13 from which passages 14 lead to the bottom of the slots 9 anda pipe 15 is mounted on the pattern plate and is suitably connected bybranches with each of the patterns. A hose 16 is con nected to the pipe15 and to a source of air supply (not shown).

In practice the standard is adjusted to raise the pattern plate andproject the patterns up through the stripping plate, as shown in Fig. 1.he expanded metal strips or other reticulated metal strips are arrangedside by side in the slots of the patterns resting on edge upon thepatterns and upon the stripping plate. Then the flash 1? is placed onthe stripping plate and sand is rammed up therein around the pat ternsand strips in the usual manner for making a mold. The shaft 6 is thenoperated by turnipg the cranl: 6 to lower the pattern plate and withdrawthe patterns from. the sand and clear of the top s1 of the patternplate, leaving mold cavities in which the metal is to be poured to castthe blocks sections upon the strips and form the insert for the brakeshoes. It often happens that these mold cavities contain more or lessloose sand clinging to the strips or otherwise disposed. therein and, asbefore stated, it has been customary heretofore to remove the tlaslr romthe machine and blow this sand out of the mold cavities by the use of ahand bellows. This blowing out operation must be separately performed oneach mold cavity and it frequently results in injury to the surface ofthe mold which necessitates repairing the mold or making it over again.My invention greatly simplifies this blowing out operation and avoidsthe danger of injuring the mold by conducting the blowing out operationon all of the cavities simultaneously and before the flask is removedfrom the stripping plate. When the patterns have been withdrawn, asheretofore described, air is ad mitted to the pipe 15 and flows throughthe chambers and the passages 14; up through the slots 9 and into themold cavities, blowing out the loose sand in the mold cavitics beforethe mold has been removed from the machine. The air blast is introducedinto all of the mold c vities simultaneously and under uniform pressurebefore the mold has been removed from the machine and the danger ofinjuring the mold surface is thereby reduced to a minimum not ontirelyeliminated. The strips are firmly supported on the stripping plate whenthe patterns withdrawn from the mold so that this operation can beperformed with out agitating or disturbing the strips and withoutbreaking up the sand forming the mold.

In the drawings 1 have shown one embodiment of the invention which maybe satisfactorily employed but it will be understood that the shape ofthe patterns may be changed, if desired and that other changes in theform, construction and arrangement of parts may be made within the scopeof the following claims. And while expanded .ietal is a form ofreticulated metal which I regard as especially desirable for the connecting strips, it will be understood that I use the word reticulated ina broad sense to include not only expanded metal and wire mesh but alsoany other kind of metal strip of a reticulated or a foraminousconstruction.

I claim:

1. In a machine for molding brake shoe inserts comprising a plurality ofblocks or sections cast at intervals on supporting and connectingstrips, the combination of a mold support, a plurality of movablepatterns t form cavities in the mold in which the blocks or sections arecast, said patterns being slotted to reoivo and support the strips uponwhich said blocks or sections are cast, and means for moving thepatterns into and withdrawing them from the mold.

2. In a machine for moloing brake shoe inserts comprising a plurality ofblocks or sections cast at intervals on supporting and connectingstrips, the combination of a mold support having openings therein, aplurality of patterns movable through said openings into and out of themold to form cavities in the mold in which the blocks or sections arecast, said patterns tapering from the lower portions to the top thereofto facilitate withdrawal from the sand and being slotted transverselybetween their ends to receive and support the strips upon which saidblocks or sections are cast, and means for moving the patterns into andwithdrawing them from the mold.

.3. In a machine for molding brake shoe inserts comprising a pluralityof blocks or sections cast at intervals on supporting and connectingstrips, the combination of a mold support, a plurality of movablepatterns to form cavities in the mold which blocks or sections are cast,said patterns being arranged side by side in parallel relation and beingslotted transversely in their upper portions and between their ends, theslots in the several patterns being located in alinement to receive andsupport the strips upon which said blocks or sections are cast, andmeans "for moving the patterns into and withdrawing them from the mold.

4b In a machine for molding brake shoe inserts comprising a plurality ofbloclrs or sections cast at intervals on supporting or connectingstrips, the combination of a mold support, a plurality of movablepatterns to form cavities in the mold in which the blocks or sectionsare cast, said patterns being slotted to receive and support the stripsupon which said blocks or sections are cast, means for supplying an airblast through the patterns to the slots therein, and means for movingthe patterns into and Withdrawing them from the mold.

5. in a machine for molding brake shoe inserts comprising a plurality ofblocks or sections cast at intervals on supporting or connecting strips,the combination of a mold support, a plurality of movable patterns toform cavities in the mold in which the blocks or sections are cast, saidpatterns being slotted to receive and support the strips upon which suchblocks and sections are cast, air passages in the patterns andconnections thereto to supply an air blast through the patterns to saidcavities, after the patterns have been withdrawn from the mold, to cleansaid cavities preparatory to the casting operation, and means for movingthe patterns into and withdrawing them from the mold. p

6. ln machine of the character described, the combination of a moldsupport, a pat tern for the mold, means for Withdrawing the pattern fromthe mold, and means for supplying an air blast through the pattern tothe mold cavity.

7. In a machine of the character described, the combination of amoldsupport having a plurality of openings, a pattern plate, a plurality ofpatterns mounted on the plate and adapted to operate in said openings,means for withdrawing the pattc ns through said openings from the mold,and means for supplying an air blast simultaneously through each patternto the mold cavities.

8. In a machine of the character described, the combination of a moldsupport having a plurality of openings, a plurality of patternsoperating in said openings and each having a plurality of parallelslots, means for withdrawing the patterns from the mold, and means forsupplying an air blast through the slots in the patterns simultaneouslyto all of the mold cavities.

9. In a machine of the character described, the combination of a moldsupport having a plurality of openings, a plurality of patternsoperating in said openings, means for withdrawing the patterns from themold, each of said patterns having a plurality of slots therein, an airchamber, passages leading from said chamber to said slots, and means forsupplying air pressure to said chambers.

10. In a machine of the character described, the combination of astripping plate having a plurality of openings therein, a plurality ofpatterns operating in said openings, means for withdrawing the patternsfrom the mold, each of said molds having means for conveying airpressure therethrough to the mold cavities, and a pipe connected to allof said molds and to a source of air supply to admit pressure to all thepatterns simultaneously.

11. In a machine of the character described, the combination of astripping plate having a plurality of openings therein, a plurality ofpatterns operating in said openings, means for withdrawing the patternsfrom the mold, each of said patterns c0mprising a block having aplurality of slots in its upper portion spaced apart, an air chamber inits lower portion, an air passage lead ing from said chamber to thebottom of said slots, and means for supplying air pressure to saidpatterns and through them to the mold cavities when the patternsarewithdrawn from the mold.

12. The herein described improvement in the art of making molds forbrake shoe inserts which consists in providing a plurality of movablepatterns for the insert blocks or sections projecting upward throughopenings in the mold support of a mold flask, each of said patternsbeing slotted to support strips of reticulated metal in parallelrelation, ramming sand in the flask around the patterns and the strips,withdrawing the patterns from the mold downward through the support, andadmitting a blast of air through the patterns to the mold before removing it from the machine to blow out any loose sand which may remainin the mold cavities and from those portions of the strips in saidcavities.

HARRY J ONES.

